////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <ctime>
#include <cerrno>
#include <cstdlib>
#include <cstring>

#include "fcntl-wrappers.h"
#include "lo-utils.h"
#include "lo-sysdep.h"
#include "oct-syscalls.h"
#include "octave-popen2.h"
#include "signal-wrappers.h"
#include "str-vec.h"
#include "unistd-wrappers.h"
#include "wait-wrappers.h"

#define NOT_SUPPORTED(nm)                       \
  nm ": not supported on this system"

namespace octave
{
  namespace sys
  {
    int
    dup2 (int old_fd, int new_fd)
    {
      std::string msg;
      return sys::dup2 (old_fd, new_fd, msg);
    }

    int
    dup2 (int old_fd, int new_fd, std::string& msg)
    {
      msg = "";

      int status = -1;

      status = octave_dup2_wrapper (old_fd, new_fd);

      if (status < 0)
        msg = std::strerror (errno);

      return status;
    }

    int
    execvp (const std::string& file, const string_vector& argv)
    {
      std::string msg;
      return sys::execvp (file, argv, msg);
    }

    int
    execvp (const std::string& file, const string_vector& args,
            std::string& msg)
    {
      msg = "";

      char **argv = args.c_str_vec ();

      int status = octave_execvp_wrapper (file.c_str (), argv);

      string_vector::delete_c_str_vec (argv);

      if (status < 0)
        msg = std::strerror (errno);

      return status;
    }

    pid_t
    fork (std::string& msg)
    {
      pid_t status = -1;

      if (octave_have_fork ())
        {
          status = octave_fork_wrapper ();

          if (status < 0)
            msg = std::strerror (errno);
        }
      else
        msg = NOT_SUPPORTED ("fork");

      return status;
    }

    pid_t
    vfork (std::string& msg)
    {
      pid_t status = -1;

      if (octave_have_vfork () || octave_have_fork ())
        {
          if (octave_have_vfork ())
            status = octave_vfork_wrapper ();
          else
            status = octave_fork_wrapper ();

          if (status < 0)
            msg = std::strerror (errno);
        }
      else
        msg = NOT_SUPPORTED ("vfork");

      return status;
    }

    pid_t
    getpgrp (std::string& msg)
    {
      pid_t status = octave_getpgrp_wrapper ();

      if (status < 0)
        msg = std::strerror (errno);

      return status;
    }

    pid_t
    getpid (void)
    {
      return octave_getpid_wrapper ();
    }

    pid_t
    getppid (void)
    {
      return octave_getppid_wrapper ();
    }

    gid_t
    getgid (void)
    {
      return octave_getgid_wrapper ();
    }

    gid_t
    getegid (void)
    {
      return octave_getegid_wrapper ();
    }

    uid_t
    getuid (void)
    {
      return octave_getuid_wrapper ();
    }

    uid_t
    geteuid (void)
    {
      return octave_geteuid_wrapper ();
    }

    int
    pipe (int *fildes)
    {
      std::string msg;
      return sys::pipe (fildes, msg);
    }

    int
    pipe (int *fildes, std::string& msg)
    {
      msg = "";

      int status = -1;

      status = octave_pipe_wrapper (fildes);

      if (status < 0)
        msg = std::strerror (errno);

      return status;
    }

    pid_t
    waitpid (pid_t pid, int *status, int options)
    {
      std::string msg;
      return sys::waitpid (pid, status, options, msg);
    }

    pid_t
    waitpid (pid_t pid, int *status, int options,
             std::string& msg)
    {
      pid_t retval = -1;
      msg = "";

      retval = octave_waitpid_wrapper (pid, status, options);

      if (retval < 0)
        msg = std::strerror (errno);

      return retval;
    }

    int
    wcontinue (void)
    {
      return octave_wcontinue_wrapper ();
    }

    int
    wcoredump (int status)
    {
      return octave_wcoredump_wrapper (status);
    }

    bool
    wifcontinued (int status)
    {
      return octave_wifcontinued_wrapper (status);
    }

    bool
    wifexited (int status)
    {
      return octave_wifexited_wrapper (status);
    }

    bool
    wifsignaled (int status)
    {
      return octave_wifsignaled_wrapper (status);
    }

    bool
    wifstopped (int status)
    {
      return octave_wifstopped_wrapper (status);
    }

    int
    wexitstatus (int status)
    {
      return octave_wexitstatus_wrapper (status);
    }

    int
    wnohang (void)
    {
      return octave_wnohang_wrapper ();
    }

    int
    wstopsig (int status)
    {
      return octave_wstopsig_wrapper (status);
    }

    int
    wtermsig (int status)
    {
      return octave_wtermsig_wrapper (status);
    }

    int
    wuntraced (void)
    {
      return octave_wuntraced_wrapper ();
    }

    int
    kill (pid_t pid, int sig)
    {
      std::string msg;
      return sys::kill (pid, sig, msg);
    }

    int
    kill (pid_t pid, int sig, std::string& msg)
    {
      msg = "";

      int status = -1;

      if (octave_have_kill ())
        {
          status = octave_kill_wrapper (pid, sig);

          if (status < 0)
            msg = std::strerror (errno);
        }
      else
        msg = NOT_SUPPORTED ("kill");

      return status;
    }

    pid_t
    popen2 (const std::string& cmd, const string_vector& args,
            bool sync_mode, int *fildes)
    {
      std::string msg;
      return sys::popen2 (cmd, args, sync_mode, fildes, msg);
    }

    pid_t
    popen2 (const std::string& cmd, const string_vector& args,
            bool sync_mode, int *fildes, std::string& msg)
    {
      char **argv = args.c_str_vec ();
      const char *errmsg;

      pid_t pid = octave_popen2 (cmd.c_str (), argv, sync_mode, fildes,
                                 &errmsg);

      string_vector::delete_c_str_vec (argv);

      if (pid < 0)
        msg = errmsg;

      return pid;
    }

    int
    fcntl (int fd, int cmd, long arg)
    {
      std::string msg;
      return sys::fcntl (fd, cmd, arg, msg);
    }

    int
    fcntl (int fd, int cmd, long arg, std::string& msg)
    {
      msg = "";

      int status = -1;

      status = octave_fcntl_wrapper (fd, cmd, arg);

      if (status < 0)
        msg = std::strerror (errno);

      return status;
    }
  }
}
